Compressor



.l. H. DENNEDY.

.COMPRESSOR. I APPLICATION FILED AUG-28. 1920.

1 41 6,695, Patented May 23, 1922,

barren stares PAT ENT JAMES H. DjE NNEDY, 013 DETROIT, MIOHTGAN, ASSIG-NOR T0 KEL'VINATOR CORPORA- TIQN, 0F DETROIT, MICHIGAN, A CORPORATION OF DELAWIVARE.

COMPRESSOR.

reac es.

To allwhom it concern:

Be it known that I, JAMEs H. DENNEDY, a citizen of the United States, residin at Detroit, in the county of Wayne and tate of Michigan, have invented a certain new and useful Improvement in Compressors, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings. 7

This invention relates to compressors for expansible fluids and has special reference to compressors of the type employed in connection with refrigerating apparatus although not restricted to such use. Among the objects of the invention are the provision of a compressor outlet valve which can be manufactured and installed with a minimum of expense and difiiculty, which shall remain tight for the longest possible pe riods, which can be assembled or replaced without grinding or other special fitting, which shall operate with a minimum of noise, and which shall contain a minimum number of parts; while further objects andadvantages of the invention will appear as the description proceeds.

In the drawings Fig. 1 illustrates a vertical sectional view of a simple type of compressor equipped with my improved valve,

Fig. 2 a horizontal sectional view taken on the broken line 22 of Fig. 1; and Fig. 3 illustrates a modified construction of valve.

Describing the parts by reference characters, 1-1 represent the cylinders and 2-2 the pistons therein; 3 While my improve ments are applicable to a compressor havin any desired number or arrangement of cy inders, the mostconvenient application is to a compressor having an even number of cylinders arranged in pairs. 3 represents a closure plate tightly secured to the open ends of the cylinders, and 4 a cap bolted to the top of said plate and having therein a chamber 5 communicating with the outlet 6. Formed in the plate 3 in communication with each cylinder are the outlet ports 8-8, surrounded on the upper side by a plurality of concentric serrations 9 consticentral projection 11. In the construction Specification of Letters Patent. Pamgnt gdl ltflg 'y 23 1922, Application filed August as, 1920. Serial No. 406,594.

shown in Figs. 1 and 2, this projection is drawn in the sheet metal and has tapered sides which fit in the apertures 12, 12 formed 1n the ends of the leaf spring 13 and its upper end projects into operative relation with the overhanging ends of the retaining member 14. Said spring and retaining member are held in place by suitable spaclng blocks 15 and screws 16, the relation being such that the sprin 13 tends to keep the valves tightly seate at all times but permitting them to rise upon occasion until stopped by the retaining member 14:. The particular arrangement here shown enables the employment of a flat 5 ring and a flat retaining member, and enab es all the parts to be made of sheet metal stampings, although any suitable material can be employed. Also the most convenient arrangementis that wherein the attachment is located midway between the outlet ports and engage the middle portions of the spring and retaining member, although other arrangements are possible. The valves 1010 separate member as shown in certain of my copending applications, and their upper edges preferably stop just short of sharpness, being first reamed to a sharp point and afterwards ground so as to produce a very narrow flat top on each, thus producing a high unit pressure with a verysmall total spring pressure.

In the embodiment valve members 10 are formed with projections comprising a flat boss 11 and a narrow part 11", the latter passing freely through apertures in the ends of the spring 13 and terminating just below the retaining member 14. This retaining member serves in both cases to limit the lift of the valves.

' The spring can either be straight or curved.

Experience proves that such valves will remain tight almost indefinitely, will open with a minimum of back pressure, will provide an opening having a minimum of construction, and will operate substantially without noise. It will be understood that I do not restrict myself to the particular constructions herein shown except as the same are specifically recited in the annexed claims.

Having thus described my invention, what I'claim is:

1. In a compressor, an outlet valve com: prising a seat, a valve member operatively engaging the same and comprising a circular sheet metal disc'having a central hollow upstanding projection, and a leaf spring overlying said seat and having an aperture snugly receiving said projection.

2. In a compressor, an outlet valve comprising a seat, a valve member operatively engaging the same and comprising a circular sheet metal disc having a central hollow upstanding projection, a leaf spring overlying said seat and having an aperture snugly receiving said projection, and a retaining member overhanging said projection and adapted to limit the lift of said valve member.

3. A compressor having a pair of outlet each surrounded by a seat, and a valve member adapted to engage each seat, each of said valve members consisting of a circular disc having a central upstanding projection, and a leaf spring having its middle portion rigidly secured to the compressor body at a point between said ports and having 1ts end aaraoea 4:. A compressor having a pair of outlet ports, each surrounded by a seat and a valve member adapted to engage each seat, each of said valve members consisting of a circular disc having a central upstanding projection, aleaf spring having its middle portion rigidly secured to the compressor body at a point between said ports and having its end portions apertured for the reception of said projections, and a retaining member projecting over each. projection above said spring and adapted to limit the displacement of the valve member.

'5. A compressor having a pair of outlet ports eachsurrounded by aseat and a valve member adaptedto engage the same, each valve member having a central upstanding projection, a leaf spring and a retaining member having their middle ortions rigidly secured to the body of sai compressor at a point between said ports and having their end portions overlying said seats, said leaf spring being apertured for the reception of said projections and said retaining member being spaced above said projections.

In testimony whereof, hereunto aflix my signature.

H. DENNEDY. 1 

